I certainly didn’t think so as I used my Paladin for countless hours of gold-making (Paladins are one of the slowest classes in the game). But then I decided to try to make a Fury Warrior with 170% base movement speed. Boy did that make a difference, I run dungeons several times faster than the Paladin, hence making 3 or 4 times more gold per hour.
Some quests in my guide are marked as "SKIP" and colored in red. These quests are simply either too hard to solo or not worth the XP/time and are skipped. My guide will only list SKIPPED quests if the quest is a direct follow up after completing a quest, not one that you have to click the NPC again to get it. If you hover over the skipped quests, it will give info on why it is skipped in the guide (unless that info is already listed directly in the guide text).